cleveland



(No Model.) I

W. P. spa. W. CLEVELAND.

STEAM; ENGINE.

No. 553,747. Patented Jan f zs, 1896.

'lNl/ENTOl-T 4M (1Q) By If WW4) M ATTORNEYS.

"""llllllllluun E-IIIIIII-Z ANDREW BJSRAHMA. FHUTO-UTHQWASNINGTOKEQ IUNITED STATES PATENT OFFICE.

WILLIAM F. CLEVELAND AND EUGENE WV. CLEVELAND, OF ROUNTIIIVAITE, CANADA.

STEAM E'NGIN E.

SPECIFICATION forming part of Letters Patent No. a747, dated January 28,1896.

Application filed November 17, 1893. Renewed July 2, 1895. Serial No.554,767. (No model.)

To all whom it may concern.-

Be it known that we,-WILLIAM FITCH CLEVE- LAND and EUGENE WYMANCLEVELAND, subjects of the Queen of Great Britain, residing atRounthwaite, in the Province of Manitoba, Dominionof Canada, haveinvented a new and Improved Steam-Engine, of which the following is afull, clear, and exact description.

The object of the invention is to provide a new and improvedsteam-engine which is simple and durable in construction, very effectivein operation,and arranged to utilize the motive agent to the fullestadvantage by providing a full and complete exhaust to preventback-pressure.

The invention consists principally of a hollow piston connected at alltimes with the exhaust, and valves on the heads or faces of the saidpiston to alternately connect the interior of the piston with the endsof the cylinder.

The invention also consists of certain parts and details, andcombinations of the same, as will be fully described hereinafter-andthen pointed out in the claims.

Reference is to be had to the accompanying drawings, forminga part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the views.

Figure 1 is a sectional side elevation of the improvement. Fig. 2 is atransverse section of the same on the. line 2 2 in Fig. 1. Fig. 3 is anend View of the improvement with one of the cylinder-heads removed, andFig. at is a plan view of the piston-valves.

The improved steam -engine is provided with a cylinder A, in whichreciprocates the hollow piston I3, secured on a piston-rod 0, connectedin the usual manner with the main drivin g-shaft of the engine. Thecylinder'A is provided at or near its ends with the inletports a and I),connected with a common steam-inlet pipe D, connected with the boiler,so that the motive agent can pass through the said pipe D into the portsa and Z), and alternately into the ends of the cylinder A, to exert itsforce against the heads or ends of the piston B.

In the ports a and b are arranged the valves E and E", respectively,connected with each other by a stem E and arranged .in such a mannerthat when one valve opens its port the other closes the other port, andvice versa.

The valve E is connected bya valve-stem 55 with suitable mechanismdriven from the main driving-shaft to impart motion to the said valvesto alternately connect the respective ports with the ends of thecylinder A. The

cylinder'A is also provided near its middle with exhaust-ports c and 61leading to branch pipes F and F of the exhaust-pipe F.

The piston B is made hollow and preferably in the shape shown in Fig. 1,by providing the said piston with two heads B and B se- 65 cured on thepiston-rod C and connected with each other by suitable stay-rods, as isplainly shown in Figs. 1 and 2. In the outer faces of the heads B and Bare formed circular seats for ring-shaped valves G and G, re- '70speetively, connected with each other by longitudinally-extending bars Gand G united at or near their middle by a suitable crosshcad G", as isplainly shown in Figs. 2 and 4:.

On the end of the bar G near the valve G 7 5 and at the inner edgethereof, is formed an incline G and. a similar incline G is formed onthe said bar near the valveG and on the outer edge thereof, as'isplainly shown in Fig. 4;. Similar inclines G and G are formed on theother bar G and the said inclines GT and G are adapted to be alternatelyengaged by friction-rollers II and H and the other inclines G and G areadapted to be alternately engaged by friction-rollers II and H Thefriction-rollers II and H are supported on a vertically-extending rodII", and the other friction-rollers II and II are held on a rod H bothrods 11 and H being secured in segmental arms Iand I, set in blocks J 0ing in the cylinder A, to securely hold the 5 said segmental arms inposition to prevent lateral motion of the same.

In the valves G and G are arranged ports 6 and f, adapted to alternatelyconnect the similar ports 9 and h, respectively, formed in the heads Band B of the piston B. The relation of the valves G and G to the valves-E and E is such that when the valve E opens its port a, as shown in Fig.1, the ports (2 in the valve G do not register with their ports g, whileat the same time the valve E closes the port b and the valve G has itsport f registering with the port h. Now, the steam in front of thepiston-head B can pass through the registering ports f and h, betweenthe piston-heads B and B and through the port into the branch pipe F tothe exhaust-pipe F.

Now, when the several parts are in the position shown in Fig. 1, thelive steam enter ing the port a passes through the valve E into the leftor outer end of the cylinder A to press against the piston-head B toforce the piston to the right in the direction of the arrow a. Steam infront of the head B now exhausts through the registering ports f h andport 0, as above described, and when the piston D nears the end of itsinward stroke the friction-rollers H and H act on the inclines G and Gso as to cause the valves G and G to turn, whereby the ports h areclosed, and the ports 9 are opened by the ports 6 registering with thesaid ports g. At the time this takes place the valves E and E shift, sothat the port a is'closed, and the port 1) opens and live motive agentnow passes into the right-hand end of the cylinder A to press on thepiston-head B to force the piston in the inverse direction of the arrowd. hen the piston travels in this direction, the steam in front of thehead B passes through the registering ports g and 6 between the heads 13and B to exhaust through the ports 0 (Z to the branch pipe F of theexhaustpipeF leading to the outside. Vhen the pi ston travels in thisdirection and nears the end of its stroke, the frictionrollers H and Hcome in contact with the inclines G and G so as to turn the valves G andG to close the ports 9 in the head B and to open the ports h in the headB The above-described operation is then repeatedthat is to say, thevalves E and E again shift to the position shown in Fig. 1 and steam nowpasses to the outer end of the cylinder A to force the piston B in thedirection of the arrow at. It will be seen by this arrangement acomplete and free exhaust is obtained as soon as the piston nears theend of the cylinder, so that no back-pressure then will be exerted onthe piston and the motive agent forcing the piston forward is utilizedto the fullest advantage.

Having thus fully described our invention, we claim as new and desire tosecure by Letters Patent- 1. A steam-engine, comprising a hollow pistonconnected at all times with the exhaust, and valves mounted to turn 011the heads or faces of the said piston, to alternately connect theinterior of the piston with the ends of the cylinder, substantially asshown and described.

2. A steam-engine, comprising a cylinder having inlet-ports at the endsof the cylinder and exhaust-ports near the middle thereof, a hollowpiston reciprocating in the said cylinder and connected at all timeswith the said eXhaust-ports, and valves mounted to turn on the heads orfaces of the said piston, to alternately connect the interior of thepiston with the ends of the cylinder, substantially as shown anddescribed.

3. A steam-engine, comprising a cylinder having inlet-ports at the endsof the cylinder and exhaust-ports near the middle thereof, a hollowpiston reciprocating in the said cylinder and connected at all timeswith the said exhaust-ports, valves mounted to turn on the heads orfaces of the said piston,to alternately connect the interior of thepiston with the ends of the cylinder, and means, substantially asdescribed, for automatically turning the said valves on the forward andbackward motion of the said piston as set forth.

4. A steam-engine, comprising a cylinder having inlet-ports at the endsof the cylinder and exhaust-ports near the middle thereof, a hollowpiston reciprocating inthe said cylinder and connected at all times withthe said exhaust-ports, valves mounted to turn 011 the heads or faces ofthe said piston,to alternately connect the interior of the piston withthe ends of the cylinder, and valves arranged in the said inlet-portsand adapted to alternately open and close the same, substantially asshown and described.

5. A steam-engine, comprising a cylinder, a piston reciprocating in thesaid cylinder and having two connected piston-heads having ports, valvesmounted to turn over the said piston-head ports, bars connecting thevalves with each other and provided with inclines, and friction-rollersheld in the said cylinder and adapted to engage the inclines of the saidbars to turn the said valves, substantially as shown and described.

WILLIAM F. CLEVELAND. EUGENE XV. CLEVELAND.

Witnesses:

LEVI STOCKTON, WILLIAM CowAN.

